iOSwebview崩溃Thread 1: "Completion handler passed to -[****ViewController webView:decidePolicyForN...

注释掉该方法，不会崩溃

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler

Completion handler passed to -[***ViewController webView:decidePolicyForNavigationAction:decisionHandler:] was not called
(
    0   CoreFoundation                      0x00007fff20420af6 __exceptionPreprocess + 242
    1   libobjc.A.dylib                     0x00007fff20177e78 objc_exception_throw + 48
    2   CoreFoundation                      0x00007fff204209d4 -[NSException initWithCoder:] + 0
    3   WebKit                              0x00007fff286da4b0 _ZN6WebKit28CompletionHandlerCallCheckerD2Ev + 124
    4   WebKit                              0x00007fff288066a3 _ZN3WTF3RefIN6WebKit28CompletionHandlerCallCheckerENS_13DumbPtrTraitsIS2_EEED2Ev + 41
    5   WebKit                              0x00007fff2885e048 _ZZN3WTF8BlockPtrIFv24WKNavigationActionPolicyEE12fromCallableIZN6WebKit15NavigationState16NavigationClient31decidePolicyForNavigationActionERNS5_12WebPageProxyEONS_3RefIN3API16NavigationActionENS_13DumbPtrTraitsISC_EEEEONSA_INS5_27WebFramePolicyListenerProxyENSD_ISH_EEEEPNSB_6ObjectEE3$_3EES3_T_ENUlPKvE_8__invokeESQ_ + 60
    6   libsystem_blocks.dylib              0x00007fff2007f42f _Block_release + 128
    7   WebKit                              0x00007fff28859a8e _ZN6WebKit15NavigationState16NavigationClient31decidePolicyForNavigationActionERNS_12WebPageProxyEON3WTF3RefIN3API16NavigationActionENS4_13DumbPtrTraitsIS7_EEEEONS5_INS_27WebFramePolicyListenerProxyENS8_ISC_EEEEPNS6_6ObjectE + 1308
    8   WebKit                              0x00007fff28901925 _ZN6WebKit12WebPageProxy31decidePolicyForNavigationActionEON3WTF3RefINS_15WebProcessProxyENS1_13DumbPtrTraitsIS3_EEEERNS_13WebFrameProxyEONS_13FrameInfoDataEyONS_20NavigationActionDataESB_NS1_8OptionalINS1_16ObjectIdentifierINS_26WebPageProxyIdentifierTypeEEEEERKN7WebCore15ResourceRequestEOSK_ON3IPC17FormDataReferenceEONSJ_16ResourceResponseERKNS_8UserDataEONS2_INS0_20PolicyDecisionSenderENS4_ISW_EEEE + 4973
    9   WebKit                              0x00007fff28900568 _ZN6WebKit12WebPageProxy42decidePolicyForNavigationActionAsyncSharedEON3WTF3RefINS_15WebProcessProxyENS1_13DumbPtrTraitsIS3_EEEENS1_16ObjectIdentifierIN7WebCore18PageIdentifierTypeEEENS8_INS9_19FrameIdentifierTypeEEEONS_13FrameInfoDataENS9_21PolicyCheckIdentifierEyONS_20NavigationActionDataESF_NS1_8OptionalINS8_INS_26WebPageProxyIdentifierTypeEEEEERKNS9_15ResourceRequestEOSN_ON3IPC17FormDataReferenceEONS9_16ResourceResponseERKNS_8UserDataEy + 296
    10  WebKit                              0x00007fff28900406 _ZN6WebKit12WebPageProxy36decidePolicyForNavigationActionAsyncEN3WTF16ObjectIdentifierIN7WebCore19FrameIdentifierTypeEEEONS_13FrameInfoDataENS3_21PolicyCheckIdentifierEyONS_20NavigationActionDataES7_NS1_8OptionalINS2_INS_26WebPageProxyIdentifierTypeEEEEERKNS3_15ResourceRequestEOSF_ON3IPC17FormDataReferenceEONS3_16ResourceResponseERKNS_8UserDataEy + 150
    11  WebKit                              0x00007fff28bc486a _ZN6WebKit12WebPageProxy17didReceiveMessageERN3IPC10ConnectionERNS1_7DecoderE + 9356
    12  WebKit                              0x00007fff285f0821 _ZN3IPC18MessageReceiverMap15dispatchMessageERNS_10ConnectionERNS_7DecoderE + 125
    13  WebKit                              0x00007fff28925fc2 _ZN6WebKit15WebProcessProxy17didReceiveMessageERN3IPC10ConnectionERNS1_7DecoderE + 28
    14  WebKit                              0x00007fff285d0eaa _ZN3IPC10Connection15dispatchMessageENSt3__110unique_ptrINS_7DecoderENS1_14default_deleteIS3_EEEE + 696
    15  WebKit                              0x00007fff285d0773 _ZN3IPC10Connection24dispatchIncomingMessagesEv + 477
    16  JavaScriptCore                      0x00007fff3221f77d _ZN3WTF7RunLoop11performWorkEv + 573
    17  JavaScriptCore                      0x00007fff3222028a _ZN3WTF7RunLoop11performWorkEPv + 26
    18  CoreFoundation                      0x00007fff2038f38a __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    19  CoreFoundation                      0x00007fff2038f282 __CFRunLoopDoSource0 + 180
    20  CoreFoundation                      0x00007fff2038e764 __CFRunLoopDoSources0 + 248
    21  CoreFoundation                      0x00007fff20388f2f __CFRunLoopRun + 878
    22  CoreFoundation                      0x00007fff203886d6 CFRunLoopRunSpecific + 567
    23  GraphicsServices                    0x00007fff2bededb3 GSEventRunModal + 139
    24  UIKitCore                           0x00007fff24690e0b -[UIApplication _run] + 912
    25  UIKitCore                           0x00007fff24695cbc UIApplicationMain + 101
    26  GovCn                               0x0000000108896020 main + 112
    27  libdyld.dylib                       0x00007fff202593e9 start + 1
)
(lldb) 

上述方法中if else，判断不满足，导致的decisionHandler没调用，所以引发该问题